free vs pick up

free

verb
  • To rid of something that confines or oppresses. 

  • To make free; set at liberty; release. 

  • To relinquish (previously allocated memory) to the system. 

noun
  • A free transfer. 

  • The usual means of restarting play after a foul is committed, where the non-offending team restarts from where the foul was committed. 

adj
  • Of a rocket or missile: not under the control of a guidance system after being launched. 

  • Thrown open, or made accessible, to all; to be enjoyed without limitations; unrestricted; not obstructed, engrossed, or appropriated; open; said of a thing to be possessed or enjoyed. 

  • Without obligations. 

  • With no or only freedom-preserving limitations on distribution or modification. 

  • Without; not containing (what is specified); exempt; clear; liberated. 

  • Privileged or individual; the opposite of common. 

  • (of a morpheme) That can be used by itself, unattached to another morpheme. 

  • Unconstrained. 

  • Unobstructed, without blockages. 

  • Unattached or uncombined. 

  • Not imprisoned or enslaved. 

  • Unconstrained by quantifiers. 

  • Not attached; loose. 

  • Unconstrained of identifiers, not bound. 

  • Not arbitrary or despotic; assuring liberty; defending individual rights against encroachment by any person or class; instituted by a free people; said of a government, institutions, etc. 

  • Unconstrained by timidity or distrust 

  • Intended for release, as opposed to a checked version. 

  • complimentary 

  • Unconstrained by relators. 

  • Obtainable without any payment. 

  • Generous; liberal. 

  • Not currently in use; not taken; unoccupied. 

adv
  • Without needing to pay. 

pick up

verb
  • To reduce the despondency of. 

  • To acquire (something) accidentally; to catch (a disease). 

  • To collect and detain (a suspect). 

  • To lift; to grasp and raise. 

  • To clean up; to return to an organized state. 

  • To point out the behaviour, habits, or actions of (a person) in a critical manner; used with on. 

  • To meet and seduce somebody for romantic purposes, especially in a social situation. 

  • To receive calls; to function correctly. 

  • To record; to notch up. 

  • To learn, to grasp; to begin to understand; to realize. 

  • To promote somebody who was previously passed over. 

  • To collect an object, especially in passing. 

  • To answer a telephone. 

  • To take control (physically) of something. 

  • To mark, to defend against an opposition player by following them closely. 

  • To behave in a manner that results in a foul. 

  • To restart or resume. 

  • To receive (a radio signal or the like). 

  • To notice, detect or discern; to pick up on 

  • To improve, increase, or speed up. 

  • To pay for. 

  • To obtain and publish a story, news item, etc. 

  • To collect a passenger. 

How often have the words free and pick up occurred in a corpus of books? (source: Google Ngram Viewer )